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The solid formed on heating baking soda gives a basic aqueous solution. Which solid is it?

Answer and explanation

Correct answer: Sodium carbonate

Baking soda is sodium hydrogen carbonate, NaHCO₃. On heating, it undergoes thermal decomposition: 2NaHCO₃ → Na₂CO₃ + CO₂ + H₂O. The solid product is sodium carbonate, and its aqueous solution is basic because carbonate ions react with water to produce hydroxide ions. Hence option B is correct. Sodium chloride and calcium sulphate are not the products of this decomposition, while calcium carbonate has the wrong composition.

Related tags

Baking SodaSodium CarbonateThermal DecompositionBasic SolutionAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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